matchesAt

Common
JVM
JS
1.7
fun matchesAt(input: CharSequence, index: Int): Boolean
(Common source) (JVM source) (JS source)

Checks if a regular expression matches a part of the specified input char sequence exactly at the specified index.

Unlike matches function, it doesn't require the match to span to the end of input.



fun main(args: Array<String>) {
//sampleStart
val releaseText = "Kotlin 1.5.30 is released!"
val versionRegex = "\\d[.]\\d[.]\\d+".toRegex()
println(versionRegex.matchesAt(releaseText, 0)) // false
println(versionRegex.matchesAt(releaseText, 7)) // true
//sampleEnd
}

Exceptions

IndexOutOfBoundsException - if index is less than zero or greater than the length of the input char sequence.